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Overview
| Comment: | Improved performance in the type handling of arithmetic operators in the VDBE. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 0c0a603950c97837442d82886f947aab |
| User & Date: | drh 2014-08-23 17:41:15 |
Context
|
2014-08-23
| ||
| 18:17 | Make the implementation of the sqlite3_aggregate_context() interface faster for second an subsequent invocations. This helps all aggregate functions to perform better. check-in: 802148f3 user: drh tags: trunk | |
| 17:41 | Improved performance in the type handling of arithmetic operators in the VDBE. check-in: 0c0a6039 user: drh tags: trunk | |
| 17:21 | Performance optimization in the applyAffinity() logic inside the VDBE. check-in: 25f2246b user: drh tags: trunk | |
Changes
Changes to src/vdbe.c.
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void sqlite3ValueApplyAffinity(
sqlite3_value *pVal,
u8 affinity,
u8 enc
){
applyAffinity((Mem *)pVal, affinity, enc);
}
/*
** Return the numeric type for pMem, either MEM_Int or MEM_Real or both or
** none.
**
** Unlike applyNumericAffinity(), this routine does not modify pMem->flags.
** But it does set pMem->r and pMem->u.i appropriately.
*/
static u16 numericType(Mem *pMem){
if( pMem->flags & (MEM_Int|MEM_Real) ){
return pMem->flags & (MEM_Int|MEM_Real);
}
if( pMem->flags & (MEM_Str|MEM_Blob) ){
if( sqlite3AtoF(pMem->z, &pMem->r, pMem->n, pMem->enc)==0 ){
return 0;
}
if( sqlite3Atoi64(pMem->z, &pMem->u.i, pMem->n, pMem->enc)==SQLITE_OK ){
return MEM_Int;
}
return MEM_Real;
}
return 0;
}
#ifdef SQLITE_DEBUG
/*
** Write a nice string representation of the contents of cell pMem
|
> > > > > > > > > > > > > > > > > > | < < < < < < |
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void sqlite3ValueApplyAffinity(
sqlite3_value *pVal,
u8 affinity,
u8 enc
){
applyAffinity((Mem *)pVal, affinity, enc);
}
/*
** pMem currently only holds a string type (or maybe a BLOB that we can
** interpret as a string if we want to). Compute its corresponding
** numeric type, if has one. Set the pMem->r and pMem->u.i fields
** accordingly.
*/
static u16 SQLITE_NOINLINE computeNumericType(Mem *pMem){
assert( (pMem->flags & (MEM_Int|MEM_Real))==0 );
assert( (pMem->flags & (MEM_Str|MEM_Blob))!=0 );
if( sqlite3AtoF(pMem->z, &pMem->r, pMem->n, pMem->enc)==0 ){
return 0;
}
if( sqlite3Atoi64(pMem->z, &pMem->u.i, pMem->n, pMem->enc)==SQLITE_OK ){
return MEM_Int;
}
return MEM_Real;
}
/*
** Return the numeric type for pMem, either MEM_Int or MEM_Real or both or
** none.
**
** Unlike applyNumericAffinity(), this routine does not modify pMem->flags.
** But it does set pMem->r and pMem->u.i appropriately.
*/
static u16 numericType(Mem *pMem){
if( pMem->flags & (MEM_Int|MEM_Real) ){
return pMem->flags & (MEM_Int|MEM_Real);
}
if( pMem->flags & (MEM_Str|MEM_Blob) ){
return computeNumericType(pMem);
}
return 0;
}
#ifdef SQLITE_DEBUG
/*
** Write a nice string representation of the contents of cell pMem
|